Corotational Truss Element

• Command_Manual
  • Tcl Commands
  • Modeling_Commands
    • model
    • uniaxialMaterial
    • ndMaterial
    • frictionModel
    • section
    • geometricTransf
    • element
    • node
    • sp commands
      • fix
      • fixX
      • fixY
      • fixZ
    • mp commands
      • equalDOF
      • rigidDiaphragm
      • rigidLink
    • timeSeries
    • pattern
    • mass
    • block commands
      • block2D
      • block3D
    • region
    • rayleigh
  • Analysis Commands
    • constraints Command
    • numberer Command
    • system Command
    • test Command
    • algorithm Command
    • integrator Command
    • analysis Command
    • eigen Command
    • analyze Command
  • Output Commands
    • recorder
    • record
    • print
    • printA
    • logFile
    • RealTime_Output_Commands
  • Misc Commands
    • eleResponse Command
    • getTime Command
    • getEleTags Command
    • getNodeTags
    • loadConst Command
    • nodeCoord Command
    • nodeDisp Command
    • nodeVel Command
    • nodeAccel Command
    • nodeEigenvector Command
    • nodeBounds
    • print Command
    • remove Command
    • reset Command
    • testIter
    • testNorms
    • wipe Command
    • exit Command
  • DataBase Commands
    • Template:DataBaseCommandsMenu

---

This command is used to construct a corotational truss element object. There are two ways to construct a corotational truss element object:

One way is to specify an area and a UniaxialMaterial identifier:

element corotTruss $eleTag $iNode $jNode $A $matTag <-rho $rho> <-cMass $cFlag> <-doRayleigh $rFlag>

the other is to specify a Section identifier:

element corotTrussSection $eleTag $iNode $jNode $secTag <-rho $rho> <-cMass $cFlag> <-doRayleigh $rFlag>

---

$eleTag	unique element object tag
$iNode $jNode	end nodes
$A	cross-sectional area of element
$matTag	tag associated with previously-defined UniaxialMaterial
$secTag	tag associated with previously-defined Section
$rho	mass per unit length, optional, default = 0.0
$cFlag	consistent mass flag, optional, default = 0
	cFlag = 0 lumped mass matrix (default)
	cFlag = 1 consistent mass matrix
$rFlag	Rayleigh damping flag, optional, default = 0
	rFlag = 0 NO RAYLEIGH DAMPING (default)
	rFlag = 1 include Rayleigh damping

NOTE:

• When constructed with a UniaxialMaterial object, the corotational truss element considers strain-rate effects, and is thus suitable for use as a damping element.

• The valid queries to a truss element when creating an ElementRecorder object are 'axialForce,' 'stiff,' deformations,' 'material matArg1 matArg2...,' 'section sectArg1 sectArg2...' There will be more queries after the interface for the methods involved have been developed further.

• For backward compatability the command 'element corotTruss $eleTag $iNode $jNode $secTag will still work and produce a CorotTrussSection element.

• CorotTruss DOES NOT include Rayleigh damping by default.

EXAMPLE:

element truss 1 2 4 5.5 9; # truss element with tag 1 added between nodes 2 and 4 with area 5.5 that uses material 9

---

Code Developed by: Michael H. Scott, Oregon State University